1. The artist's work pushes our civilization to a higher level.
改进：Artists' work upgrades our civilization.
2. For example, you work in a big factory.
改进: Suppose you work in a big factory.
3. You'll find you are fit for business and you can make it your main job.
改进：You'll find that you are cut out for business and you can make it your career.
4. We will own nothing at all if we depend on luck.
改进: We will get nowhere if we rely on luck.
5. He will get a higher salary to improve his living level.
改进: He will get a higher salary, thus improving his life.
6. Their brain is still very young.
改进: They are still immature.
7. Dissatisfaction makes people produce desire for better things.
改进: Dissatisfaction impels people for the better.
8. They can't analyze clearly what is right and what is wrong.
改进: They cannot tell right from wrong.
9. It will help children to form a good habit of dealing with time.
改进: It will help children learn to make good use of time.
10. Though it is not the best job, it afford to his life.
改进: Though it is not the best job, a job is a job. He can make ends meet with it.
11. Since people are always not satisfied with their present situation, they want further development.
改进: Since people are never satisfied with their status quo, they want further development.
12. The only thing they need to do is to find a job which can easily get big money.
改进: The only thing they need to do is to find a job that can bring them big money.
13. They like an active life but not a peaceful life.
改进: They like an active life rather than a peaceful one.